The planet is undergoing a sixth mass extinction, the sixth time in the history of life on Earth that global fauna has experienced a major collapse in numbers.
As a result, insects are dying off at record rates, animal species are experiencing "biological annihilation," and invasive aliens are driving native species to extinction.
Although it may not be obvious, another devastating mass extinction event is taking place today — the sixth of its kind in Earth's history.
Read more: Insects are dying off at record rates — an ominous sign we're in the middle of a 6th mass extinction A 2017 study found that animal species around the world are experiencing a "biological annihilation" and that our current "mass extinction episode has proceeded further than most assume."
Here are 12 signs that the planet is in the midst of the sixth mass extinction, and why human activity is primarily to blame.